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选修3
选修3
Unit7-Topic Talk
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Unit8-Topic Talk
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Unit8-Lesson 2
Unit8-Lesson 3
Unit8-Writing Workshop
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Unit9-Topic Talk
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Unit9-Writing Workshop
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clone
vt.克隆;使无性繁育;n.克隆动植物;无性繁殖的个体
edit
vi.&vt.编辑;编校;剪辑;剪接
gene
n.基因
artificially
adv.人为地;虚假地
barrier
n.障碍;壁垒;隔阂;
identical
adj.完全相同的;非常相似的
twin
n.双胞胎中的一个;双胞胎之一的;
mammal
n.哺乳动物
camel
n.骆驼
cattle
n.牛